inexpiable sin

14 LETTERS · STARTS WITH I

inexpiable sin is a valid 14-letter word worth 24 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1N1E1X8P3I1A1B3L1E1S1I1N1

1 + 1 + 1 + 8 + 3 + 1 + 1 + 3 + 1 + 1 + 0 + 1 + 1 + 1 =24 PTS

DOUBLE WORD → 48TRIPLE WORD → 72

MEANING

What does inexpiable sin mean?